Skip to main content
. Author manuscript; available in PMC: 2017 Apr 13.
Published in final edited form as: J Exp Anal Behav. 2013 May 23;100(1):49–60. doi: 10.1002/jeab.31

Fig. 3.

Fig. 3

Comparison-response rates in pecks/sec (± 1 SEM) on the hue–form matching baseline trials (open circles) and the nonreinforced symmetry (form–hue) probe trials (filled circles) averaged over the eight test sessions for each Group DL pigeon. Positive = reinforced hue–form baseline trials and nonreinforced test trials where the samples and comparisons of the reinforced baseline trials were reversed. Negative = nonreinforced hue–form baseline trials and test trials where the samples and comparisons of the baseline trials were reversed.